Portion of a boot upper



FIG. 1 is a left side elevational view of a portion of a boot upper, showing my new design; and,

FIG. 2 is a front, left side perspective view thereof.

The claimed design is for a portion of a boot upper according to the embodiment illustrated in the drawing views of FIGS. 1 and 2, and also encompasses an embodiment that is the corresponding portion of the opposite matching boot upper, i.e., an embodiment that is a mirror image of the embodiment illustrated in FIGS. 1 and 2. The broken lines shown in the drawings represent portions of a boot upper that form no part of the claimed design. 

CLAIM The ornamental design for a portion of a boot upper, as shown and described. 